Car tester Reinhold Deisenhofer took the four-seater Porsche Gran Turismo Sport out on the road to hear it roar. The new Panamera has more performance, grooved and vented brake discs, ten millimeters less ground clearance, dynamic chassis control, and adaptive air suspension - all as standard.The Panamera GTS' powerplant is a naturally aspirated V8 engine with 4.8 liters of capacity and an output of 316 kilowatts.